This is a plan to prevent zebra mussels and other aquatic nuisance species from spreading westward. This document includes background on the issue, including the current and potential impacts, ecological, economic and otherwise, the spread of these...

David Lenhart oral history interview as conducted by Jerry C. Grover. Mr. Lenhart worked at the following locations during his tenure with the Fish and Wildlife Service: Matanuska Valley, Alaska, 1955, GS-5; 1956 GS-5 Umatilla, Oregon; Portland...